Template Toolkit - Display array by ID

Question

I want to display a block of an array by the ID - can I do this using Template Toolkit or will it be in the Perl controller side? (I'm using Dancer & REST::Client to grab the JSON)

This is the JSON:

    {
        "user":
        [
            { 
            "id": 12345,
                "name": bob,
                "age": 22,
                "birth_place": "London"
            },
            { 
            "id": 12346,
                "name": amy,
                "age": 20,
                "birth_place": "London"
            }
        ]
    }

I'm getting the ID of the user in the controller so I can display the ID in the template with [% user.id %]. So I want to be able to basically do

1) If user id matches the id of one of the id's in the JSON

2) Display data from that block

Name: [% content.name %]
Age: [% content.age %]
Birth Place: [% content.birth_place %]

Any help? :)

Answer 1

If you need to check for multiple users, you really want a hash rather than an array.

my $data = decode_json(...);
my %data_by_userid = map { $_->{id} => $_ } @{ $data->{user} };

Template parameters:

data_by_userid => \%data_by_userid

Then, you'd use

[% user = data_by_userid.$id -%]
[% IF user -%]
Name: [% user.name %]
Age: [% user.age %]
Birth Place: [% user.birth_place %]
[% END -%]

---

If you only need one user in the template, just use

my $data = decode_json(...);
my ($user) = grep { $_->{id} == $id } @{ $data->{user} };

Template parameters:

user => $user

Then, you'd use

[% IF user -%]
Name: [% user.name %]
Age: [% user.age %]
Birth Place: [% user.birth_place %]
[% END -%]